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Will keep using them for another year or so still. They defo help to keep the nappy secure!
Until they size out probably
My 3 year old is still in a vest. Just not the type that you do up underneath. I suspect I’ll be keeping them both in vests through most of primary school at least.
2-3 years is the biggest size that is easily available. I find these always come up small, so my first grew out around ages 2, which is when/why I stopped using. As above commenter, the nappy hangs weirdly without a vest, and a vest also stops them from lifting their top up / scratching!
Do you mean due to the weather or age? As weather wise they’re such easy layers. Age wise I’ll keep using them for a few years I imagine!